Fluid feeder we left on patio ultimately getting drier (3,5)
I believe the answer is:
tea towel
'drier' is the definition.
(something that dries)
'fluid feeder we left on patio ultimately' is the wordplay.
'fluid feeder' becomes 'teat' (eg a teat on a bottle).
'left' becomes 'l' (common abbreviation).
'on' says to put letters next to each other.
'ultimately' says to take the final letters.
The last letter of 'patio' is 'o'.
'we'+'l'='wel'
'wel' put after 'o' is 'owel'.
'teat'+'owel'='TEA-TOWEL'
'getting' is the link.
(Other definitions for tea towel that I've seen before include "Washing-up cloth" , "Cloth for drying washed dishes" , "Washing-up drier" , "Cloth for wiping up" , "Wee total (anag) - drier" .)